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Source driving apparatus and driving method thereof

Inactive Publication Date: 2010-02-04
RAYDIUM SEMICON
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The invention is directed to a source driving apparatus and a driving method thereof. By way of appropriate encoding, noises, which would otherwise occur when the bit change in adjacent gray levels is too large, are avoided, hence effectively enhancing display quality.

Problems solved by technology

However, if the bit change in the level shifter, the first column latch and the second column latch is large, a large transient current will be required instantaneously and noises will be generated.
Consequently, the generated noises will affect the grounding level and cause bias to the level of the voltage outputted from the digital / analog converter.
Therefore, unevenness will occur at where the bit change is large and severely affect display quality.

Method used

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  • Source driving apparatus and driving method thereof
  • Source driving apparatus and driving method thereof

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Embodiment Construction

[0022]Referring to FIG. 3, a source driving apparatus according to a preferred embodiment of the invention is shown. The source driving apparatus 40 comprises an encoder 20 and a source driver 30. The encoder 20 encodes the video data with n bits Y1 to an encoded data Y2 according to a suitable encoding rule, such that the bit change in two adjacent grays of the video data Y1 is less than n. The source driver 30 outputs a pixel voltage corresponding to the video data Y1 according to the encoded data Y2. Referring to FIG. 4, an encoding table according to a first encoding rule is shown. The above encoding rule is gray code for example. Let 6 bits be taken for example. The video data Y1 is encoded to an encoded data Y2 by the encoder 20 according to the gray code. If the decimal value of the video data Y1 is “31” before encoding, the corresponding binary value is 011111, and the corresponding binary value of the encoded data Y2 is 010000. If the decimal value of the video data Y1 is “...

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Abstract

A source driving apparatus and a driving method thereof are provided. The source driving apparatus comprises an encoder and a source driver. The encoder encodes a video data with n bits to the encoded data according to encoding rules, such that the bit change in two adjacent grays is less than n. The source driver outputs a pixel voltage corresponding to the video data according to the encoded data.

Description

[0001]This application claims the benefit of Taiwan application Serial No. 97128902, filed Jul. 30, 2008, the subject matter of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates in general to a source driving apparatus and a driving method thereof, and more particularly to a source driving apparatus capable of reducing noise and a driving method thereof.[0004]2. Description of the Related Art[0005]Referring to FIG. 1, a block diagram of a source driver is shown. The source driver 10 comprises a shift register 110, a first column latch 120, a second column latch 130, a level shifter 140 and a digital / analog converter 150. The shift register 110 controls the first column latch 120 to sequentially receive the video data. After the first column latch 120 finishes data receiving, the first column latch 120 outputs the stored video data to the second column latch 130. After the level of the video data stored in ...

Claims

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Application Information

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IPC IPC(8): G09G5/00
CPCG09G3/3648G09G2320/0247G09G2310/0289
Inventor HUNG, SHAO-PING
Owner RAYDIUM SEMICON
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